Question
$$(x-3)(2x-6) = 0$$
Answer
$$ x = 3 $$
Explanation
$$ \begin{aligned} (x-3)(2x-6) &= 0&& \text{simplify left side} \\[1 em]2x^2-6x-6x+18 &= 0&& \\[1 em]2x^2-12x+18 &= 0&& \\[1 em] \end{aligned} $$
$ 2x^{2}-12x+18 = 0 $ is a quadratic equation.
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